I hele diamantfamilien, ekte svarte diamanter er også svært sjeldne. Diamanter med en stor mengde svarte inneslutninger regnes generelt som diamanter av lav kvalitet og kan bare brukes til industrielle formål. De Griscono Spirit Diamond er en sjelden svart diamant på edelstensnivå i verden, and it is also the largest cut black diamond […]
Kategoriarkiv: Smykkernyheter
Amsterdam diamant (Amsterdam diamant), produsert i Sør-Afrika, er også en kjent svart diamant. Rudiamanten veier 55,85 ct, er mørk svart og ugjennomsiktig, så det er også det samme under sterkt lys, men denne diamanten har en veldig sterk glans. Diamanten ble kuttet og polert av Amsterdam Drucker & Sønner. Fra oktober 1972 […]
(3) Cullinan No. 3: It is pear-shaped and weighs 94.40ct. It was inlaid on the top of Queen Mary’s crown. (4) Cullinan IV: It is in the shape of a long-angled ladder and weighs 63.70ct. It was inlaid on the circular edge of Queen Mary’s crown. The Cullinan No. 3 diamond is now set as […]
The naked eye identification of rough diamonds should start from the following aspects. (1) Observe the gloss Since diamonds have a typical diamond luster, which is an important feature that distinguishes other colorless and transparent minerals (or materials), diamonds can be distinguished from other imitations by using their luster characteristics. When observing the gloss of […]
The unique properties of diamond make it leave some cutting characteristics during processing, these characteristics are not possessed by diamond imitations, so it is possible to identify diamonds and imitations. 1. Facets, edges and corners The high hardness of the diamond determines that the diamond has a flat surface, straight edges, and sharp corners, mens […]
I 1970, Tel Aviv was already one of the world’s major diamond cutting centers. From its initial focus on cutting small diamonds, Israel has transformed into a major cutter of large and fancy diamonds in the 1980s. The diamond processing factory in Israel is known as the model of the highest level of diamond technology […]
Antwerp has dominated the gem trading in Europe since the Middle Ages. På 1400-tallet, it has become the center of diamond cutting and trading. In the 20th century, it became the center of cutting and grinding large diamonds. I dag, it has undoubtedly become the world’s most rough and cut diamonds. Trading hub for […]
The object of color grading is Cape series diamonds, which are graded from colorless to light yellow according to color density. Colorless to light yellow with continuous color changes are artificially defined as a series of boundaries. These boundaries are also color levels, which represent a certain color density range. The higher the color level, […]
Gemology nowadays originated in the eighteenth century AD. Before that, humans in ancient times had known to decorate themselves with animal bones, skjell, fjær, beautiful stones and other objects. With the development of history, different jewelry cultures have gradually developed. What can be called a gem? Enkelt sagt, all kinds of materials that can be […]
The geological conditions of gem formation are different, and the distribution area of gems mainly depends on the properties of the rock mass formed by the gems. For eksempel, diamonds are formed in Kimberlite, but not all Kimberlites produce diamonds. It still depends on whether the area has sufficient conditions for diamonds to grow; og […]